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Where is DNA located in a prokaryotic cell?

Q. Where is DNA located in a prokaryotic cell?

1. Nucleus

2. Nucleolus

3. Nucleoid

4. Mitochondria

Answer: 3 (Nucleoid).

Where is DNA located in a prokaryotic cell?

Explanation: Prokaryotes do not have a nucleus, nucleolus, and mitochondria which are cellular compartments in the eukaryotic cells that contain genetic material (DNA). The DNA in prokaryotes is located in a central region of the cell called the nucleoid.

As a nucleus, the nucleoid is not surrounded by a nuclear membrane. In addition to nucleoid, there is another independent DNA molecule in the prokaryotes are called a plasmid, which is completely different from the chromosomal DNA of prokaryotes. However, plasmids provide genetic advantages to the prokaryotes in specific conditions.

Example: Multi-drug resistance.

 

Important questions:

  1.  The alpha-helix and beta-sheet are found at which level of protein organization?
  2. Which cytoskeletal proteins provide the structural support for microvilli?
  3. Which of these does not contain a structural protein?
  4. What level of protein structure is associated with the sequence of amino acids?
  5. Which of the following pertains to typhoid fever?
  6. Which of the following tests is an agglutination test for the bacterium causing typhoid fever?
  7. Questions on nucleic acids
  8. This is a compound made from a group of covalently bonded atoms?
  9. If two covalently bonded atoms are identical the bond is?
  10. Which of the following are characteristics of G protein-coupled receptors (GPCR)?
  11. What are the second messengers in the GPCR-phospholipase c signal transduction system?
  12. Which of the following have a significant influence on a material’s electrical resistivity?
  13. What are alleles? And an example.
  14. What is one difference between the DNA replication of bacteria and eukaryotes?
  15. Which of the following genotypes is homozygous recessive?
  16. If q = .4, what is the frequency of homozygous recessive individuals?
  17. A person who is homozygous recessive at a locus has which of the following?
  18. If cohesin was not produced or not functional what would be the effect on mitosis?
  19. Which of these is a reverse transcriptase?
  20. Which of the following functions as cell identity markers, receptors, and enzymes?
  21. Which cytoskeletal proteins provide the structural support for microvilli?
  22. The alpha-helix and beta-sheet are found at which level of protein organization?
  23. Thermogenin in the inner membrane of brown fat cell mitochondria does all of the following except?
  24. What is ATP synthase and what does it do?
  25. Brown fat cells produce a protein called Thermogenin
  26. Which of the following eukaryotic cell structures plays a role in protein trafficking and sorting?
  27. Which of these does not contain a structural protein?
  28. After which checkpoint is the cell first committed to continuing the cell cycle through M?
  29. Which of the following statements about ATP (adenosine triphosphate) is correct?
  30. What happens in the G1 phase of the cell cycle?
  31. In general, enzymes are what kinds of molecules?
  32. The junction between the axon of one neuron and the dendrite of the next is called
  33. What is the role of enzymes in the DNA replication process?
  34. How do enzymes speed up chemical reactions?
  35. In the liver, detoxifying enzymes are localized in what organelle?

 

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